Shelf unit



FIG. 1 is a front perspective view of a shelf unit showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a plan view thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a sectional view taken along line 5--5 as shown in FIG. 2; and,

FIG. 6 is a front perspective view of a second embodiment of the shelf unit shown in FIG. 1. 

The ornamental design for a shelf unit, as shown and described. 